Value: optimize isRuntimeValue

src/InternPool.zig

@@ -5702,6 +5702,10 @@ pub fn isNoReturn(ip: *const InternPool, ty: Index) bool {
     };
 }
 
+pub fn isRuntimeValue(ip: *const InternPool, val: Index) bool {
+    return ip.items.items(.tag)[@intFromEnum(val)] == .runtime_value;
+}
+
 /// This is a particularly hot function, so we operate directly on encodings
 /// rather than the more straightforward implementation of calling `indexToKey`.
 pub fn zigTypeTagOrPoison(ip: *const InternPool, index: Index) error{GenericPoison}!std.builtin.TypeId {

src/value.zig

@@ -1823,7 +1823,7 @@ pub const Value = struct {
     }
 
     pub fn isRuntimeValue(val: Value, mod: *Module) bool {
-        return mod.intern_pool.indexToKey(val.toIntern()) == .runtime_value;
+        return mod.intern_pool.isRuntimeValue(val.toIntern());
     }
 
     /// Returns true if a Value is backed by a variable